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Identifying and solving algae problem

I am 3+ days into SLAM but have a persistent algae problem (attached photo). The alleged algae shows up in same spot every day (also in the corner of the deep end). It brushes like a fine dust but returns the next day. Brushing daily and running Z5 2-4 times a day. Slammed at mustard level+++ for 24 hrs (39 is MA slam level per calculator). Filtering (sand) 24/7 and maintaining pressure within range. 3-4 chlorine adjustments/per day. Water is otherwise very clear and had decent chemistry before starting SLAM. TF-100 test kit. 25,000g vinyl liner. Uncovered and good sun during day. Autocover at night.

Please help identifying algae (usually makes appearance most overnight) but also a little during day between vacuuming and thoughts on how long SLAM will take to solve. Thought I was making progress on day 2 but OCLT dropped a ton on day 3.